ASSESSMENT OF IMPACT ON AQUACULTURE USING REMOTE

SENSING DATA AND GIS

ABSTRACT The rapid development of the sites (an increase in both reared surface areaand production), tropical shrimp aquaculture is currently being faced with criticalproblems due to economical and ecological constraints. In many countries withfavourable conditions for shrimp aquaculture sites are often badly selected and/orover-exploited. This conducts to sorne extent to decreases or collapses in theproduction due to the difficulty in predicting the maximum production capacity ofthe sites. Furthermore, it appears that production sustainability depends on manyfactors among which socio-economy and ecology gy are of prime importance.Remote sensing provides a synoptic vision over large land expanses. Severa!scenes were processed for landuse mapping using conventional classificationtechniques. Concerning water quality assessment, a general relation for the Javasea was found between image and field data in terms of total suspended matter.Applying this relation to a new site in Sumatra has provided an initial approach towater type and, together with land use mapping, a preliminary assessment of thesuitability of the area. ali geographie data originated from the variouscompartments of the study have been geo-referenced and loaded into ageographical information system. This allows to display any query made on spatialvariables and their related statistical data, including the ir variations over the lastfew years and to reveal patterns and phenomena otherwise not obvious.OBJECTIVES(i) improve site selection and study the impact of aquaculture on marineenvironments presenting a variable sensitivity to organic sewage,(ii) analyse the socio-economical aspects and profitability of the aquacultureindustry and of common resources(iii) Use remote sensing and geographical data bases for diagnosis and monitoringof site degradationNEED In our project aims to make effective use of remote sensing via detectingtotal suspended matter (TSM) to evaluate the possible adverse effects ofaquaculture The aquaculture activity in this study refers specifically to marineaquaculture. An officially allocated area for intense aquaculture activity waschosen as the study area. The effects were evaluated in terms of TSM the analysisfocused on the derivation of data from satellite imagery using an artificial NNapproach. A second objective was to construct a time series of remotely senseddata to evaluate the temporal changes, which can be further developed for effectivemonitoring in dynamic marine ecosystems.